Bicycle have been used at war
for a long time, at least since WWI, (Bicycle infantry). The last bicycle
unit was dispanded by Switzerland in 2003. in fact, At war, bicycles were
used to movetroops, and equipment and supplies. In other wars throughout
the century, bicycles also have played important parts (Vietnam war, in
China, in Japan with about 50 000 bike troupes, WWII where British troupes
used foldable bikes etc.. see also http://en.wikipedia.org/wiki/Bicycle#Bicycles_and_war_)
Reports can be found that special troups in Afghanistan are using bicycles
in fight against the Taliban.

In cities world wide, bicycle
units are used for regular policing.

Unfortunately, in recent decades,
bicycles have also been used for delivering bombs, including in suicide
missions. (don't forget people who want to kill do anything, including
using baby strollers - so it is not the fault of the bicycle / I'm afraid
that city officials could ban bikes on subways becaues of the potential
for weaponizing it). As part of my news paintings. I have painted a selection
of those reports below.